Time-reversal symmetry breaking and s−wave superconductivity in CaPd2Ge2: A μSR study
V. K. Anand, A. Bhattacharyya, D. T. Adroja, K. Panda, P. K. Biswas, A. D. Hillier, B. Lake
DOI 10.1103/PhysRevB.108.224519 · Physical Review B
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Abstract
CaPd2Ge2 which crystallizes in ThCr2Si2-type body-centered tetragonal structure exhibits superconductivity below the critical temperature Tc=1.69K. We have investigated the superconducting gap structure and time-reversal symmetry of the ground state in CaPd2Ge2 by means of muon spin relaxation and rotation (μSR) measurements. Our analysis of μSR data collected in a transverse magnetic field reveals BCS superconductivity with a single-band s-wave singlet pairing and an isotropic energy gap having the value 2Δ(0)/kBTc=3.50(1). Further, an increased relaxation rate in zero-field μSR asymmetry spectra below Tc provides evidence for the presence of a spontaneous magnetic field in the superconducting state, revealing that the time-reversal symmetry is broken in CaPd2Ge2.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaPd2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.69 | Pressure not reported | unknown |
| CaPd2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.27 | Pressure not reported | unknown |
| SrPd2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3 | Pressure not reported | unknown |
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